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Additional collections of scanned books, articles, and other texts (usually organized by topic) are presented here.

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Arxiv.org
Sep 24, 2013 Eric F. Bell; Chris Wolf; Klaus Meisenheimer; Hans-Walter Rix; Andrea Borch; Simon Dye; Martina Kleinheinrich; Lutz Wisotzki; Daniel H. McIntosh
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eye 61
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We present the rest-frame colors and luminosities of ~25000 m_R
Source: http://arxiv.org/abs/astro-ph/0303394v2
Arxiv.org
Sep 24, 2013 Adam F. Kowalski; Suzanne L. Hawley; Jon A. Holtzman; John P. Wisniewski; Eric J. Hilton
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eye 33
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The white light during M dwarf flares has long been known to exhibit the broadband shape of a T~10,000 K blackbody, and the white light in solar flares is thought to arise primarily from Hydrogen recombination. Yet, a current lack of broad wavelength coverage solar-flare spectra in the optical/near-UV prohibits a direct comparison of the continuum properties to determine if they are indeed so different. New spectroscopic observations of a secondary flare during the decay of a megaflare on the...
Source: http://arxiv.org/abs/1109.0837v1
Arxiv.org
Sep 24, 2013 Qi Ding; Eric D. Kolaczyk
texts
eye 29
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Random projection is widely used as a method of dimension reduction. In recent years, its combination with standard techniques of regression and classification has been explored. Here we examine its use with principal component analysis (PCA) and subspace detection methods. Specifically, we show that, under appropriate conditions, with high probability the magnitude of the residuals of a PCA analysis of randomly projected data behaves comparably to that of the residuals of a similar PCA...
Source: http://arxiv.org/abs/1109.4408v2
Arxiv.org
Sep 24, 2013 Eric G. Blackman
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eye 27
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Some recent results and open issues in magnetic dynamo theory are addressed. The distinction between small-scale and mean-field dynamo (MFD) action in forced turbulent flows is emphasized. Though useful, the MFD has been controversial. This is partly due to concerns about its need for helically forced turbulence, but mainly because simple "textbook" treatments are kinematic and linear. The non-linear backreaction of the growing magnetic field has been suspected to prematurely quench...
Source: http://arxiv.org/abs/astro-ph/0205002v2
Arxiv.org
texts
eye 30
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We investigate field-line separation in strong MHD turbulence using direct numerical simulations. We find that in the static-magnetic-field approximation the thermal conductivity in galaxy clusters is reduced by a factor of about 50 relative to the Spitzer thermal conductivity of a non-magnetized plasma. This value is too small for heat conduction to balance radiative cooling in clusters.
Source: http://arxiv.org/abs/astro-ph/0303217v2
Arxiv.org
Sep 24, 2013 Eric Braaten; Agustin Nieto
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eye 32
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The Debye screening mass for a quark-gluon plasma at high temperature is calculated to next-to-leading order in the QCD coupling constant from the correlator of two Polyakov loops. The result agrees with the screening mass defined by the location of the pole in the gluon propagator as calculated by Rebhan. It is logarithmically sensitive to nonperturbative effects associated with the screening of static chromomagnetic fields.
Source: http://arxiv.org/abs/hep-ph/9408273v1
Arxiv.org
Sep 24, 2013 Eric V. Siegel; Kathleen R. McKeown
texts
eye 52
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We apply decision tree induction to the problem of discourse clue word sense disambiguation with a genetic algorithm. The automatic partitioning of the training set which is intrinsic to decision tree induction gives rise to linguistically viable rules.
Source: http://arxiv.org/abs/cmp-lg/9408007v1
Arxiv.org
Sep 24, 2013 Eric Zaslow
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eye 52
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We present evidence for an undiscovered link between N=2 supersymmetric quantum field theories and the mathematical theory of helices of coherent sheaves. We give a thorough review for nonspecialists of both the mathematics and physics involved, and invite the reader to take up the search for this elusive connection.
Source: http://arxiv.org/abs/hep-th/9408133v1
Arxiv.org
Sep 24, 2013 Ming F. Hsu; Eric R. Dufresne; David A. Weitz
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eye 45
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While the important role of electrostatic interactions in aqueous colloidal suspensions is widely known and reasonably well-understood, the relevance of charge in nonpolar suspensions remains mysterious. We demonstrate that particles can have surprisingly strong electrostatic interactions in low dielectric constant environments when ions are solubilized by reverse micelles. A simple thermodynamic model, relating the structure of the micelles to the equilibrium ionic strength, is in good...
Source: http://arxiv.org/abs/cond-mat/0412185v2
Arxiv.org
texts
eye 30
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Uniform large deviations for the laws of the paths of the solutions of the stochastic nonlinear Schrodinger equation when the noise converges to zero are presented. The noise is a real multiplicative Gaussian noise. It is white in time and colored in space. The path space considered allows blow-up and is endowed with a topology analogue to a projective limit topology. Thus a large variety of large deviation principle may be deduced by contraction. As a consequence, asymptotics of the tails of...
Source: http://arxiv.org/abs/math/0412319v1
Arxiv.org
Sep 24, 2013 Eric Harrelson
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eye 26
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The homology of a 2-colored dioperad of decorated Riemann surfaces, relevant to open-closed string field theory, is computed. The structure it describes is realized in an open-closed setting of string topology via an action at the level of topological spaces.
Source: http://arxiv.org/abs/math/0412249v2
Arxiv.org
Sep 24, 2013 Daniel E. Holz; Eric V. Linder
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eye 32
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Observation of the expansion history of the Universe allows exploration of the physical properties and energy density of the Universe's various constituents. Standardizable candles such as Type Ia supernovae remain one of the most promising and robust tools in this endeavor, by allowing for a direct measure of the luminosity distance-redshift curve, and thereby producing detailed studies of the dark energy responsible for the Universe's currently accelerating expansion. As such observations are...
Source: http://arxiv.org/abs/astro-ph/0412173v1
Arxiv.org
Sep 24, 2013 Eric M. Schlegel
texts
eye 26
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We briefly describe a serendipitous observation of the little-studied intermediate polar WX Pyx using XMM-Newton. The X-ray spin period is 1557.3 sec, confirming the optical period published in 1996. An orbital period of approximately 5.54 hr is inferred from the separation of the spin-orbit sidelobe components. The soft and hard band spin-folded light curves are nearly sinusoidal in shape. The best-fit spectrum is consistent with a bremsstrahlung temperature of about 18 keV. An upper limit of...
Source: http://arxiv.org/abs/astro-ph/0412431v1
Arxiv.org
Sep 24, 2013 Davor Krajnovic; Michele Cappellari; Eric Emsellem; Richard M. McDermid; P. Tim de Zeeuw
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eye 30
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We study the large-scale stellar and gaseous kinematics of the E4 galaxy NGC2974, based on panoramic integral-field data obtained with SAURON. We quantify the velocity fields with Fourier methods (kinemetry), and show that the large-scale kinematics is largely consistent with axisymmetry. We construct general axisymmetric dynamical models for the stellar motions using Schwarzschild's orbit-superposition method, and compare the inferred inclination and mass-to-light ratio with the values...
Source: http://arxiv.org/abs/astro-ph/0412186v1
Arxiv.org
Sep 24, 2013 Liliya L. R. Williams; Crystal Austin; Eric Barnes; Arif Babul; Julianne Dalcanton
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High resolution N-body simulations have all but converged on a common empirical form for the shape of the density profiles of halos, but the full understanding of the underlying physics of halo formation has eluded them so far. We investigate the formation and structure of dark matter halos using analytical and semi-analytical techniques. Our halos are formed via an extended secondary infall model (ESIM); they contain secondary perturbations and hence random tangential and radial motions which...
Source: http://arxiv.org/abs/astro-ph/0412442v2
Arxiv.org
Sep 24, 2013 Eric Armengaud; Guenter Sigl; Francesco Miniati
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eye 38
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We compare the propagation of iron and proton nuclei above 10^19 eV in a structured Universe with source and magnetic field distributions obtained from a large scale structure simulation and source densities about 10^(-5) Mpc^(-3). All relevant cosmic ray interactions are taken into account, including photo-disintegration and propagation of secondary products. Iron injection predicts spectral shapes different from proton injection which disagree with existing data below about 30 EeV. Injection...
Source: http://arxiv.org/abs/astro-ph/0412525v1
Arxiv.org
Sep 24, 2013 Eric Bertin; Olivier Dauchot; Michel Droz
texts
eye 39
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We study a class of non-equilibrium lattice models describing local redistributions of a globally conserved quantity, which is interpreted as an energy. A particular subclass can be solved exactly, allowing to define a statistical temperature T_{th} along the same lines as in the equilibrium microcanonical ensemble. We compute the response function and find that when the fluctuation-dissipation relation is linear, the slope T_{FD}^{-1} of this relation differs from the inverse temperature...
Source: http://arxiv.org/abs/cond-mat/0412071v1
Arxiv.org
Sep 24, 2013 Eric Braaten; Masaoki Kusunoki
texts
eye 35
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If the recently-discovered charmonium-like state X(3872) is a loosely-bound S-wave molecule of the charm mesons D^0 \bar D^{*0} or D^{*0} \bar D^0, it can be produced through the weak decay of the B meson into D^0 \bar D^{*0} K or D^{*0} \bar D^0 K followed by the coalescence of the charm mesons at a long-distance scale set by the scattering length of the charm mesons. The long-distance factors in the amplitude for the decay B \to XK are determined by the binding energy of X, while the...
Source: http://arxiv.org/abs/hep-ph/0412268v2
Arxiv.org
Sep 24, 2013 Eric B. Ford
texts
eye 31
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High-precision radial velocity planet searches have surveyed over ~2000 nearby stars and detected over ~200 planets. While these same stars likely harbor many additional planets, they will become increasingly challenging to detect, as they tend to have relatively small masses and/or relatively long orbital periods. Therefore, observers are increasing the precision of their observations, continuing to monitor stars over decade timescales, and also preparing to survey thousands more stars. Given...
Source: http://arxiv.org/abs/astro-ph/0412703v2
Arxiv.org
Sep 24, 2013 David B. Chua; Eric D. Kolaczyk; Mark Crovella
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eye 24
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Network service providers and customers are often concerned with aggregate performance measures that span multiple network paths. Unfortunately, forming such network-wide measures can be difficult, due to the issues of scale involved. In particular, the number of paths grows too rapidly with the number of endpoints to make exhaustive measurement practical. As a result, there is interest in the feasibility of methods that dramatically reduce the number of paths measured in such situations while...
Source: http://arxiv.org/abs/cs/0412037v2
Arxiv.org
Sep 24, 2013 Eric W. Peng; Holland C. Ford; Kenneth C. Freeman
texts
eye 37
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The study of planetary nebulae (PNe) in the nearby post-merger elliptical galaxy NGC 5128 (Cen A) now has a history of nearly twenty years. As the nearest giant elliptical, it is a prime target for extragalactic PN studies. These studies have addressed many issues including the galaxy's distance, dark matter content, halo structure, merger history, and stellar populations. We review the main PN studies that have been conducted in NGC 5128, and introduce a new study where we measure the...
Source: http://arxiv.org/abs/astro-ph/0412449v1
Arxiv.org
Sep 24, 2013 Dorota Gondek-Rosinska; Michal Bejger; Tomek Bulik; Eric Gourgoulhon; Pawel Haensel; Francois Limousin; Keisuke Taniguchi; Leszek Zdunik
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eye 73
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Coalescing compact star binaries are expected to be among the strongest sources of gravitational radiation to be seen by laser interferometers. We present calculations of the final phase of inspiral of equal mass irrotational neutron star binaries and strange quark star binaries. Six types of equations of state at zero temperature are used - three realistic nuclear equations of state of various softness and three different MIT bag models of strange quark matter. We study the precoalescing stage...
Source: http://arxiv.org/abs/gr-qc/0412010v2
Arxiv.org
Sep 24, 2013 Eric B. Ford
texts
eye 41
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The Space Interferometry Mission (SIM) will make precise astrometric measurements that can be used to detect planets around nearby stars. Since observational time will be extremely valuable, it is important to consider how the choice of the observing schedule influences the efficiency of SIM planet searches. We have conducted Monte Carlo simulations of astrometric observations to understand the effects of different scheduling algorithms. We find that the efficiency of planet searches is...
Source: http://arxiv.org/abs/astro-ph/0412341v1
Arxiv.org
texts
eye 28
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The close similarity between the hierarchies of multiple-point correlation functions for the diffusion-limited coalescence and annihilation processes has caused some recent confusion, raising doubts as to whether such hierarchies uniquely determine an infinite particle system. We elucidate the precise relations between the two processes, arriving at the conclusion that the hierarchy of correlation functions does provide a complete representation of a particle system on the line. We also...
Source: http://arxiv.org/abs/cond-mat/0412745v1
Arxiv.org
Sep 24, 2013 Eric Moreau; Olivier Vallée
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eye 34
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We present a complete analytical resolution of the one dimensional Burgers equation with the elastic forcing term $-\kappa^{2} x+f(t)$, $\kappa\in\mathbb{R}$. Two methods existing for the case $\kappa=0$ are adapted and generalized using variable and function transformations, valid for all values of space an time. The emergence of a Fokker-Planck equation in the method allows to connect a fluid model, depicted by the Burgers equation, with an Ornstein-Uhlenbeck process.
Source: http://arxiv.org/abs/physics/0412136v4
Arxiv.org
Sep 24, 2013 Eric Braaten; H. -W. Hammer
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eye 30
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An effective field theory for the three-body system with large scattering length a is applied to three-body recombination into deep bound states in a Bose gas. The recombination constant \alpha is calculated to first order in the short-distance interactions that allow the recombination. For a < 0, the dimensionless combination m \alpha/(\hbar a^4) is a periodic function of \ln |a| that exhibits resonances at values of a that differ by multiplicative factors of 22.7. This dramatic behavior...
Source: http://arxiv.org/abs/cond-mat/0103331v2
Arxiv.org
Sep 24, 2013 Eric Bedford; John Smillie
texts
eye 28
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In this paper we use complex techniques to study the structure of real Henon diffeomorphisms of maximal topological entropy.
Source: http://arxiv.org/abs/math/0103038v1
Arxiv.org
Sep 24, 2013 Eric F. Preston; Jorge S. Sá Martins; John B. Rundle
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eye 29
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Mean field slider block models have provided an important entry point for understanding the behavior of discrete driven threshold systems. We present a method of constructing these models with an arbitrary frictional weakening function. This `forced weakening' method unifies several existing approaches, and multiplies the range of possible weakening laws. Forced weakening also results in Abelian rupture propagation, so that an avalanche size depends only on the initial stress distribution. We...
Source: http://arxiv.org/abs/cond-mat/0103452v1
Arxiv.org
Sep 24, 2013 David R. Andersen; Matthew A. Bershady; Linda S. Sparke; John S. Gallagher; Eric M. Wilcots
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eye 39
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We have measured the intrinsic disk ellipticity for 7 nearby, nearly face-on spiral galaxies by combining Densepak integral-field spectroscopy with I-band imaging from the WIYN telescope. Initially assuming an axisymmetric model, we determine kinematic inclinations and position angles from H-alpha velocity fields, and photometric axis ratios and position angles from imaging data. We interpret the observed disparities between kinematic and photometric disk parameters in terms of an intrinsic...
Source: http://arxiv.org/abs/astro-ph/0103193v1
Arxiv.org
Sep 24, 2013 Eric Sharpe
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eye 23
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In this short review we outline some recent developments in understanding string orbifolds. In particular, we outline the recent observation that string orbifolds do not precisely describe string propagation on quotient spaces, but rather are literally sigma models on objects called quotient stacks, which are closely related to (but not quite the same as) quotient spaces. We show how this is an immediate consequence of definitions, and also how this explains a number of features of string...
Source: http://arxiv.org/abs/hep-th/0103008v2
Arxiv.org
Sep 24, 2013 Michela Varagnolo; Eric Vasserot
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eye 23
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We define a quantum analogue of the Grothendieck ring of finite dimensional modules of a quantum affine algebra of simply laced type. The construction is based on perverse sheaves on a variety related to quivers. We get also a new geometric construction of the tensor category of finite dimensional modules of a finite dimensional simple Lie algebra of type A-D-E.
Source: http://arxiv.org/abs/math/0103182v3
Arxiv.org
Sep 24, 2013 Keisuke Taniguchi; Eric Gourgoulhon; Silvano Bonazzola
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eye 20
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We study equilibrium sequences of close binary systems composed of identical polytropic stars in Newtonian gravity. The solving method is a multi-domain spectral method which we have recently developed. An improvement is introduced here for accurate computations of binary systems with stiff equation of state ($\gamma > 2$). The computations are performed for both cases of synchronized and irrotational binary systems with adiabatic indices $\gamma=3,~2.5,~2.25,~2$ and 1.8. It is found that...
Source: http://arxiv.org/abs/gr-qc/0103041v2
Arxiv.org
Sep 24, 2013 Eric Gawiser; Arthur M. Wolfe; Jason X. Prochaska; Kenneth M. Lanzetta; Noriaki Yahata; Andreas Quirrenbach
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We report the first observations of the clustering environment of damped Lyman alpha absorption systems at z=4. Color selection and photometric redshifts were used to select 44 candidate Lyman-break galaxies brighter than I_AB=25.5 from deep BRI images of the 35 sq. arcmin field containing the quasar BR 0951-04. Multislit spectroscopy of 35 candidate galaxies was performed and 8 of these candidates have been confirmed as z>3.5 Lyman-break galaxies. With only BRI photometry, the photometric...
Source: http://arxiv.org/abs/astro-ph/0103387v2
Arxiv.org
Sep 24, 2013 Guillaume Ovarlez; Evelyne Kolb; Eric Clément
texts
eye 55
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We study the rheology of a granular material slowly driven in a confined geometry. The motion is characterized by a steady sliding with a resistance force increasing with the driving velocity and the surrounding relative humidity. For lower driving velocities a transition to stick-slip motion occurs, exhibiting a blocking enhancement whith decreasing velocity. We propose a model to explain this behavior pointing out the leading role of friction properties between the grains and the container's...
Source: http://arxiv.org/abs/cond-mat/0103143v1
Arxiv.org
Sep 24, 2013 Eric Bedford; John Smillie
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eye 31
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This paper continues our investigation of the dynamics of polynomial diffeomorphisms of C^2. We introduce a dynamical property of polynomial diffeomorphisms that generalizes hyperbolicity in the way that semi-hyperbolicity generalizes hyperbolicity for polynomial maps of the complex plane.
Source: http://arxiv.org/abs/math/0103037v1
Arxiv.org
Sep 24, 2013 R. Bacon; Y. Copin; G. Monnet; Bryan W. Miller; J. R. Allington-Smith; M. Bureau; C. Marcella Carollo; Roger L. Davies; Eric Emsellem; Harald Kuntschner; Reynier F. Peletier; E. K. Verolme; P. Tim de Zeeuw
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eye 53
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A new integral-field spectrograph, SAURON, is described. It is based on the Tiger principle, and uses a lenslet array. SAURON has a large field of view and high throughput, and allows simultaneous sky subtraction. Its design is optimized for studies of the stellar kinematics, gas kinematics, and line-strength distributions of nearby early-type galaxies. The instrument design and specifications are described, as well as the extensive analysis software which was developed to obtain fully...
Source: http://arxiv.org/abs/astro-ph/0103451v1
Arxiv.org
Sep 24, 2013 George E. Andrews; Eric S. Egge; Wolfgang Gawronski; Lance L. Littlejohn
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eye 38
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The Jacobi-Stirling numbers were discovered as a result of a problem involving the spectral theory of powers of the classical second-order Jacobi differential expression. Specifically, these numbers are the coefficients of integral composite powers of the Jacobi expression in Lagrangian symmetric form. Quite remarkably, they share many properties with the classical Stirling numbers of the second kind which, as shown in LW, are the coefficients of integral powers of the Laguerre differential...
Source: http://arxiv.org/abs/1112.6111v1
Arxiv.org
Sep 24, 2013 Eric B. Gregory; Alan C. Irving; Christopher M. Richards; Craig McNeile
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We report on a high statistics lattice QCD calculation of the mass of the eta and eta' mesons using ASQTAD improved staggered fermions. The calculation used two ensembles with different lattice spacings and pion masses. We also report results for eta-eta' mixing. The results are in satisfactory agreement with other lattice calculations using other fermion formulations and with experiment, given the the unphysical quark masses used. We see no evidence of abnormal behaviour at the lattice...
Source: http://arxiv.org/abs/1112.4384v4
Arxiv.org
Sep 24, 2013 Florian Angeletti; Eric Bertin; Patrice Abry
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eye 25
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Using a renormalization approach, we study the asymptotic limit distribution of the maximum value in a set of independent and identically distributed random variables raised to a power q(n) that varies monotonically with the sample size n. Under these conditions, a non-standard class of max-stable limit distributions, which mirror the classical ones, emerges. Furthermore a transition mechanism between the classical and the non-standard limit distributions is brought to light. If q(n) grows...
Source: http://arxiv.org/abs/1112.2965v2
Arxiv.org
Sep 24, 2013 Maarten Arnst; Roger Ghanem; Eric Phipps; John Red-Horse
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eye 34
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Coupled problems with various combinations of multiple physics, scales, and domains are found in numerous areas of science and engineering. A key challenge in the formulation and implementation of corresponding coupled numerical models is to facilitate the communication of information across physics, scale, and domain interfaces, as well as between the iterations of solvers used for response computations. In a probabilistic context, any information that is to be communicated between subproblems...
Source: http://arxiv.org/abs/1112.4772v2
Arxiv.org
Sep 24, 2013 Eric C. Chi; Tamara G. Kolda
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eye 64
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Tensors have found application in a variety of fields, ranging from chemometrics to signal processing and beyond. In this paper, we consider the problem of multilinear modeling of sparse count data. Our goal is to develop a descriptive tensor factorization model of such data, along with appropriate algorithms and theory. To do so, we propose that the random variation is best described via a Poisson distribution, which better describes the zeros observed in the data as compared to the typical...
Source: http://arxiv.org/abs/1112.2414v3
Arxiv.org
Sep 24, 2013 Pierre Albin; Eric Leichtnam; Rafe Mazzeo; Paolo Piazza
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In this paper we prove a variety of results about the signature operator on Witt spaces. First, we give a parametrix construction for the signature operator on any compact, oriented, stratified pseudomanifold X which satisfies the Witt condition. This construction, which is inductive over the `depth' of the singularity, is then used to show that the signature operator is essentially self-adjoint and has discrete spectrum of finite multiplicity, so that its index -- the analytic signature of X...
Source: http://arxiv.org/abs/1112.0989v1
Arxiv.org
Sep 24, 2013 Rosalind E. Skelton; Eric F. Bell; Rachel S. Somerville
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eye 34
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We explore the effects of mergers on the evolution of massive early-type galaxies by modeling the evolution of their stellar populations in a hierarchical context. We investigate how a realistic red sequence population set up by z~1 evolves under different assumptions for the merger and star formation histories, comparing changes in color, luminosity and mass. The purely passive fading of existing red sequence galaxies, with no further mergers or star formation, results in dramatic changes at...
Source: http://arxiv.org/abs/1112.1077v2
Arxiv.org
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We present an analysis of the ages and star-formation history of the F-type stars in the Upper Scorpius (US), Upper Centaurus-Lupus (UCL) and Lower Centaurus-Crux (LCC) subgroups of Scorpius-Centaurus. We find that 1) our empirical isochrones are consistent with the previously published age-rank of the Sco-Cen subgroups, 2) LCC and UCL appear to reach the main sequence turn-on at spectral types ~F4 and ~F2, respectively. An analysis of the A-type stars shows US reaching the main sequence at...
Source: http://arxiv.org/abs/1112.1695v2
Arxiv.org
Sep 24, 2013 Eric Kemp-Benedict
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eye 73
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Scaling relations, such as the IPAT equation and the Kaya identity, are useful for quickly gauging the scale of economic, technological, and demographic changes required to reduce environmental impacts and pressures; in the case of the Kaya identity, the environmental pressure is greenhouse gas emissions. However, when considering large-scale economic transformation, as with a shift to a low-carbon economy, the IPAT and Kaya identities and their cousins fail to capture the legacy of existing...
Source: http://arxiv.org/abs/1112.0758v2
Arxiv.org
Sep 24, 2013 Maarten Arnst; Roger Ghanem; Eric Phipps; John Red-Horse
texts
eye 53
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comment 0
Coupled problems with various combinations of multiple physics, scales, and domains are found in numerous areas of science and engineering. A key challenge in the formulation and implementation of corresponding coupled numerical models is to facilitate the communication of information across physics, scale, and domain interfaces, as well as between the iterations of solvers used for response computations. In a probabilistic context, any information that is to be communicated between subproblems...
Source: http://arxiv.org/abs/1112.4761v2
Arxiv.org
Sep 24, 2013 Eric J. Lentz; Anthony Mezzacappa; O. E. Bronson Messer; Matthias Liebendörfer; W. Raphael Hix; Stephen W. Bruenn
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eye 92
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We have conducted a series of numerical experiments with the spherically symmetric, general relativistic, neutrino radiation hydrodynamics code Agile-BOLTZTRAN to examine the effects of several approximations used in multidimensional core-collapse supernova simulations. Our code permits us to examine the effects of these approximations quantitatively by removing, or substituting for, the pieces of supernova physics of interest. These approximations include: (1) using Newtonian versus general...
Source: http://arxiv.org/abs/1112.3595v1
Arxiv.org
Sep 24, 2013 Benjamin A. Mazin; Bruce Bumble; Seth R. Meeker; Kieran O'Brien; Sean McHugh; Eric Langman
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Microwave Kinetic Inductance Detectors, or MKIDs, have proven to be a powerful cryogenic detector technology due to their sensitivity and the ease with which they can be multiplexed into large arrays. A MKID is an energy sensor based on a photon-variable superconducting inductance in a lithographed microresonator, and is capable of functioning as a photon detector across the electromagnetic spectrum as well as a particle detector. Here we describe the first successful effort to create a...
Source: http://arxiv.org/abs/1112.0004v1
Arxiv.org
Sep 24, 2013 Romain Dubessy; Karina Merloti; Laurent Longchambon; Paul-Eric Pottie; Thomas Liennard; Aurélien Perrin; Vincent Lorent; Hélène Perrin
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We describe an experiment to produce 87Rb Bose-Einstein condensates in an optically plugged magnetic quadrupole trap, using a blue-detuned laser. Due to the large detuning of the plug laser with respect to the atomic transition, the evaporation has to be carefully optimized in order to efficiently overcome the Majorana losses. We provide a complete theoretical and experimental study of the trapping potential at low temperatures and show that this simple model describes well our data. In...
Source: http://arxiv.org/abs/1112.0660v2
Arxiv.org
Sep 24, 2013 Eric M. Huff; Tim Eifler; Christopher M. Hirata; Rachel Mandelbaum; David Schlegel; Uros Seljak
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eye 34
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Statistical weak lensing by large-scale structure -- cosmic shear -- is a promising cosmological tool, which has motivated the design of several large upcoming surveys. Here, we present a measurement of cosmic shear using coadded Sloan Digital Sky Survey (SDSS) imaging in 168 square degrees of the equatorial region, with r
Source: http://arxiv.org/abs/1112.3143v1
Arxiv.org
Sep 24, 2013 Andrea Zoia; Eric Dumonteil; Alain Mazzolo
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By building upon a Feynman-Kac formalism, we assess the distribution of the number of hits in a given region for a broad class of discrete-time random walks with scattering and absorption. We derive the evolution equation for the generating function of the number of hits, and complete our analysis by examining the moments of the distribution, and their relation to the walker equilibrium density. Some significant applications are discussed in detail: in particular, we revisit the gambler's ruin...
Source: http://arxiv.org/abs/1112.3368v1
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Sep 24, 2013 Thomas N. Gautier III; David Charbonneau; Jason F. Rowe; Geoffrey W. Marcy; Howard Isaacson; Guillermo Torres; Francois Fressin; Leslie A. Rogers; Jean-Michel Désert; Lars A. Buchhave; David W. Latham; Samuel N. Quinn; David R. Ciardi; Daniel C. Fabrycky; Eric B. Ford; Ronald L. Gilliland; Lucianne M. Walkowicz; Stephen T. Bryson; William D. Cochran; Michael Endl; Debra A. Fischer; Steve B. Howel; Elliott P. Horch; Thomas Barclay; Natalie Batalha; William J. Borucki; Jessie L. Christiansen; John C. Geary; Christopher E. Henze; Matthew J. Holman; Khadeejah Ibrahim; Jon M. Jenkins; Karen Kinemuchi; David G. Koch; Jack J. Lissauer; Dwight T. Sanderfer; Dimitar D. Sasselov; Sara Seager; Kathryn Silverio; Jeffrey C. Smith; Martin Still; Martin C. Stumpe; Peter Tenenbaum; Jeffrey Van Cleve
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We present the discovery of the Kepler-20 planetary system, which we initially identified through the detection of five distinct periodic transit signals in the Kepler light curve of the host star 2MASSJ19104752+4220194. We find a stellar effective temperature Teff=5455+-100K, a metallicity of [Fe/H]=0.01+-0.04, and a surface gravity of log(g)=4.4+-0.1. Combined with an estimate of the stellar density from the transit light curves we deduce a stellar mass of Mstar=0.912+-0.034 Msun and a...
Source: http://arxiv.org/abs/1112.4514v2
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Sep 24, 2013 Eric Bertin
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We propose a simple phenomenological model exhibiting on-off intermittency over an extended range of control parameter. We find that the distribution of the 'off' periods has as a power-law tail with an exponent varying continuously between -1 and -2, at odds with standard on-off intermittency which occurs at a specific value of the control parameter, and leads to the exponent -3/2. This non-trivial behavior results from the competition between a strong slowing down of the dynamics at small...
Source: http://arxiv.org/abs/1112.0189v2
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Sep 24, 2013 Joshua T. Vogelstein; John M. Conroy; Louis J. Podrazik; Steven G. Kratzer; Eric T. Harley; Donniell E. Fishkind; R. Jacob Vogelstein; Carey E. Priebe
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Quadratic assignment problems (QAPs) arise in a wide variety of domains, ranging from operations research to graph theory to computer vision to neuroscience. In the age of big data, graph valued data is becoming more prominent, and with it, a desire to run algorithms on ever larger graphs. Because QAP is NP-hard, exact algorithms are intractable. Approximate algorithms necessarily employ an accuracy/efficiency trade-off. We developed a fast approximate quadratic assignment algorithm (FAQ). FAQ...
Source: http://arxiv.org/abs/1112.5507v4
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Sep 24, 2013 Alison Crocker; Melanie Krips; Martin Bureau; Lisa M. Young; Timothy A. Davis; Estelle Bayet; Katherine Alatalo; Leo Blitz; Maxime Bois; Frédéric Bournaud; Michele Cappellari; Roger L. Davies; P. T. de Zeeuw; Pierre-Alain Duc; Eric Emsellem; Sadegh Khochfar; Davor Krajnovic; Harald Kuntschner; Pierre-Yves Lablanche; Rchard M. McDermid; Raffaella Morganti; Thorsten Naab; Tom Oosterloo; Marc Sarzi; Nicholas Scott; Paolo Serra; Anne-Marie Weijmans
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Surveying eighteen 12CO-bright galaxies from the ATLAS3D early-type galaxy sample with the Institut de Radio Astronomie Millim\'etrique (IRAM) 30m telescope, we detect 13CO(1-0) and 13CO(2-1) in all eighteen galaxies, HCN(1-0) in 12/18 and HCO+(1-0) in 10/18. We find that the line ratios 12CO(1-0)/13CO(1-0) and 12CO(1-0)/HCN(1-0) are clearly correlated with several galaxy properties: total stellar mass, luminosity-weighted mean stellar age, molecular to atomic gas ratio, dust temperature and...
Source: http://arxiv.org/abs/1112.3641v1
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Sep 24, 2013 Wim Beenakker; Silja Brensing; Michael Krämer; Anna Kulesza; Eric Laenen; Irene Niessen
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We report on the resummation of soft-gluon emissions for squark-antisquark production at next-to-next-to-leading-logarithmic (NNLL) accuracy. We will put particular emphasis on the one loop hard matching coefficients required to perform the resummation. Furthermore we will discuss the numerical effect of the different ingredients in the corrections. We find a significant reduction in the scale uncertainty and a considerable increase in the prediction of the total cross section at the central...
Source: http://arxiv.org/abs/1112.5057v1
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Sep 24, 2013 Robert M. Loughnane; Matt P. Redman; Eric R. Keto; Nadia Lo; Maria R. Cunningham
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Although hydrogen cyanide has become quite a common molecular tracing species for a variety of astrophysical sources, it, however, exhibits dramatic non-LTE behaviour in its hyperfine line structure. Individual hyperfine components can be strongly boosted or suppressed. If these so-called hyperfine line anomalies are present in the HCN rotational spectra towards low or high mass cores, this will affect the interpretation of various physical properties such as the line opacity and excitation...
Source: http://arxiv.org/abs/1112.1743v1
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Sep 24, 2013 Eric D. Miller; Marshall Bautz; Jithin George; Richard Mushotzky; David Davis; J. Patrick Henry
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The outskirts of galaxy clusters, near the virial radius, remain relatively unexplored territory and yet are vital to our understanding of cluster growth, structure, and mass. In this presentation, we show the first results from a program to constrain the state of the outer intracluster medium (ICM) in a large sample of galaxy clusters, exploiting the strengths of three complementary X-ray observatories: Suzaku (low, stable background), XMM-Newton (high sensitivity), and Chandra (good spatial...
Source: http://arxiv.org/abs/1112.0034v1
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Sep 24, 2013 Keaton J. Bell; Eric J. Hilton; James R. A. Davenport; Suzanne L. Hawley; Andrew A. West; Allen B. Rogel
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We use ~12,000 spectra of ~3,500 magnetically active M0-M9 dwarfs from the Sloan Digital Sky Survey taken at 10-15 minute intervals, together with ~300 spectra of ~60 M0-M8 stars obtained hourly with the Hydra multi-object spectrometer, to probe H\alpha\ variability on timescales of minutes to weeks. With multiple observations for every star examined, we are able to characterize fluctuations in H\alpha emission as a function of activity strength and spectral type. Stars with greater magnetic...
Source: http://arxiv.org/abs/1112.1411v1
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Sep 24, 2013 Éric Fusy; Peter Clote
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It is a classical result of Stein and Waterman that the asymptotic number of RNA secondary structures is $1.104366 \cdot n^{-3/2} \cdot 2.618034^n$. Motivated by the kinetics of RNA secondary structure formation, we are interested in determining the asymptotic number of secondary structures that are locally optimal, with respect to a particular energy model. In the Nussinov energy model, where each base pair contributes -1 towards the energy of the structure, locally optimal structures are...
Source: http://arxiv.org/abs/1112.4610v3
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Sep 24, 2013 Aaron F. Mertz; Shiladitya Banerjee; Yonglu Che; Guy K. German; Ye Xu; Callen Hyland; M. Cristina Marchetti; Valerie Horsley; Eric. R. Dufresne
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To understand how the mechanical properties of tissues emerge from interactions of multiple cells, we measure traction stresses of cohesive colonies of 1-27 cells adherent to soft substrates. We find that traction stresses are generally localized at the periphery of the colony and the total traction force scales with the colony radius. For large colony sizes, the scaling appears to approach linear, suggesting the emergence of an apparent surface tension of order 1E-3 N/m. A simple model of the...
Source: http://arxiv.org/abs/1112.5804v4
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Sep 24, 2013 Eric Blais; Amit Weinstein; Yuichi Yoshida
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Given a function f: {0,1}^n \to {0,1}, the f-isomorphism testing problem requires a randomized algorithm to distinguish functions that are identical to f up to relabeling of the input variables from functions that are far from being so. An important open question in property testing is to determine for which functions f we can test f-isomorphism with a constant number of queries. Despite much recent attention to this question, essentially only two classes of functions were known to be...
Source: http://arxiv.org/abs/1112.5741v1
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Sep 24, 2013 Endre Kajari; Alexander Wolf; Eric Lutz; Giovanna Morigi
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Two defect particles that couple to a harmonic chain, acting as common reservoir, can become entangled even when the two defects do not directly interact and the harmonic chain is effectively a thermal reservoir for each individual defect. This dynamics is encountered for sufficiently low temperatures of the chain and depends on the initial state of the two oscillators. In particular, when each defect is prepared in a squeezed state, entanglement can be found at time scales at which the steady...
Source: http://arxiv.org/abs/1112.5300v3
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Sep 24, 2013 Mikael Kuusela; Tommi Vatanen; Eric Malmi; Tapani Raiko; Timo Aaltonen; Yoshikazu Nagai
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Most classification algorithms used in high energy physics fall under the category of supervised machine learning. Such methods require a training set containing both signal and background events and are prone to classification errors should this training data be systematically inaccurate for example due to the assumed MC model. To complement such model-dependent searches, we propose an algorithm based on semi-supervised anomaly detection techniques, which does not require a MC training sample...
Source: http://arxiv.org/abs/1112.3329v3
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Sep 24, 2013 Eric Steinbring; William Ward; James R. Drummond
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Nighttime visible-light sky brightness and transparency are reported for the Polar Environment Research Laboratory (PEARL), located on a 610-m high ridge near the Eureka research station, on Ellesmere Island, Canada. Photometry of Polaris obtained in V band with the PEARL All Sky Imager (PASI) over two winters is supported by standard meteorological measurements and visual estimates of sky conditions from sea level. These data show that during the period of the study, October through March of...
Source: http://arxiv.org/abs/1112.3067v1
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Sep 24, 2013 Rei Kurita; Eric R. Weeks
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Often experimentalists study colloidal suspensions that are nominally monodisperse. In reality these samples have a polydispersity of 4-10%. At the level of an individual particle, the consequences of this polydispersity are unknown as it is difficult to measure an individual particle size from microscopy. We propose a general method to estimate individual particle radii within a moderately concentrated colloidal suspension observed with confocal microscopy. We confirm the validity of our...
Source: http://arxiv.org/abs/1112.1460v2
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Sep 24, 2013 Bruny Baret; Imre Bartos; Boutayeb Bouhou; Eric Chassande-Mottin; Alessandra Corsi; Irene Di Palma; Corinne Donzaud; Marco Drago; Chad Finley; Gareth Jones; Sergey Klimenko; Antoine Kouchner; Szabolcs Márka; Zsuzsa Márka; Luciano Moscoso; Maria Alessandra Papa; Thierry Pradier; Giovanni Prodi; Peter Raffai; Virginia Re; Jameson Rollins; Francesco Salemi; Patrick Sutton; Maggie Tse; Véronique Van Elewyck; Gabriele Vedovato
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We present the baseline multimessenger analysis method for the joint observations of gravitational waves (GW) and high-energy neutrinos (HEN), together with a detailed analysis of the expected science reach of the joint search. The analysis method combines data from GW and HEN detectors, and uses the blue-luminosity-weighted distribution of galaxies. We derive expected GW+HEN source rate upper limits for a wide range of source parameters covering several emission models. Using published...
Source: http://arxiv.org/abs/1112.1140v2
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Sep 24, 2013 Lee R. Spitler; Ivo Labbé; Karl Glazebrook; S. Eric Persson; Andy Monson; Casey Papovich; Kim-Vy H. Tran; Gregory B. Poole; Ryan Quadri; Pieter van Dokkum; Daniel D. Kelson; Glenn G. Kacprzak; Patrick J. McCarthy; David Murphy; Caroline M. S. Straatman; Vithal Tilvi
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We report the first results from the Z-FOURGE survey: the discovery of a candidate galaxy cluster at z = 2.2 consisting of two compact overdensities with red galaxies detected at >20{\sigma} above the mean surface density. The discovery was made possible by a new deep (Ks < 24.8 AB 5{\sigma}) Magellan/FourStar near-IR imaging survey with 5 custom medium-bandwidth filters. The filters pinpoint the location of the Balmer/4000\AA\ break in evolved stellar populations at 1.5 < z < 3.5,...
Source: http://arxiv.org/abs/1112.2691v2
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Sep 24, 2013 Gary L. Hunter; Eric R. Weeks
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We investigate cage breaking in dense hard disk systems using a model of three Brownian disks confined within a circular corral. This system has a six-dimensional configuration space, but can be equivalently thought to explore a symmetric one-dimensional free energy landscape containing two energy minima separated by an energy barrier. The exact free energy landscape can be calculated as a function of system size. Results of simulations show the average time between cage breaking events follows...
Source: http://arxiv.org/abs/1112.5128v1
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Sep 24, 2013 Eric Heisler; Nobuhiko J. Suematsu; Akinori Awazu; Hiraku Nishimori
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When an ensemble of self-propelled camphor boats move in a one-dimensional channel, they exhibit a variety of collective behaviors. Under certain conditions, the boats tend to cluster together and move in a relatively tight formation. This type of behavior, referred to as clustering or swarming here, is one of three types recently observed in experiment. Similar clustering behavior is also reproduced in simulations based on a simple theoretical model. Here we examine this model to determine the...
Source: http://arxiv.org/abs/1112.2576v2
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Sep 23, 2013 Eric D. Kolaczyk; Pavel N. Krivitsky
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The modeling and analysis of networks and network data has seen an explosion of interest in recent years and represents an exciting direction for potential growth in statistics. Despite the already substantial amount of work done in this area to date by researchers from various disciplines, however, there remain many questions of a decidedly foundational nature --- natural analogues of standard questions already posed and addressed in more classical areas of statistics --- that have yet to even...
Source: http://arxiv.org/abs/1112.0840v3
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Sep 23, 2013 Paul Westoby; Carole Mundell; Neil Nagar; Witold Maciejewski; Eric Emsellem; Martin Roth; Joris Gerssen; Ivan Baldry
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Using the Inamori Magellan Areal Camera and Spectrograph (IMACS) integral-field unit (IFU) on the 6.5m Magellan telescope, we have designed the first statistically significant investigation of the two-dimensional distribution and kinematics of ionized gas and stars in the central kiloparsec regions of a well-matched sample of Seyfert and inactive control galaxies selected from the Sloan Digital Sky Survey. The goals of the project are to use the fine spatial sampling (0.2 arcsec/pixel) and...
Source: http://arxiv.org/abs/1112.4497v1
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Sep 23, 2013 Ira B. Schwartz; Eric Forgoston; Simone Bianco; Leah B. Shaw
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Extinction appears ubiquitously in many fields, including chemical reactions, population biology, evolution, and epidemiology. Even though extinction as a random process is a rare event, its occurrence is observed in large finite populations. Extinction occurs when fluctuations due to random transitions act as an effective force which drives one or more components or species to vanish. Although there are many random paths to an extinct state, there is an optimal path that maximizes the...
Source: http://arxiv.org/abs/1112.4908v1
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Sep 23, 2013 George E. Hassel; Nanase Harada; Eric Herbst
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In previous warm-up chemical models of the low-mass star-forming region L1527, we investigated the evolution of carbon-chain unsaturated hydrocarbon species when the envelope temperature is slightly elevated to $T\approx 30$ K. These models demonstrated that enhanced abundances of such species can be explained by gas-phase ion-molecule chemistry following the partial sublimation of methane from grain surfaces. We also concluded that the abundances of hydrocarbon radicals such as the C$_{\rm...
Source: http://arxiv.org/abs/1112.1997v1
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Sep 23, 2013 Eric Balandraud; Benjamin Girard; Simon Griffiths; Yahya Ould Hamidoune
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Denoting by Sigma(S) the set of subset sums of a subset S of a finite abelian group G, we prove that |Sigma(S)| >= |S|(|S|+2)/4-1 whenever S is symmetric, |G| is odd and Sigma(S) is aperiodic. Up to an additive constant of 2 this result is best possible, and we obtain the stronger (exact best possible) bound in almost all cases. We prove similar results in the case |G| is even. Our proof requires us to extend a theorem of Olson on the number of subset sums of anti-symmetric subsets S from...
Source: http://arxiv.org/abs/1112.1929v1